Malicious PDF — malware analysis report

Static analysis result for SHA-256 c776e1c5571f7237…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 11:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e559b183ae00c80ca4ef185ee38b229 SHA-1: 366459fcd49e93a0009c78df5173fa52aa4f0141 SHA-256: c776e1c5571f7237def3a7bd7cc46351e5334f555c66d488cc24b6369a714ccc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=google+maps+android+api+authorization+failure PDF link annotation
    • https://himalayanwanderer.com/himalayan/userfiles/files/lamaxajafebafife.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/82680386204.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/53244806182.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/1707311582.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/15722834848.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/38096859648.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/70638700259.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613586a9a8f88---6458636262.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/bofopobisul.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/63079845267.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/jojuxur.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021961911507211.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/61778186472.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/poraviditedonizimezot.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/kelepaj.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///12956020424.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/54432910171.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/karuzejasanogutuzi.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/43027495506.pdfIn PDF document text
    • https://istanajp.com/contents/files/11962839275.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109100927436071.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/69372114427.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/latovuvejeda.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 11144 bytes
SHA-256: 7c07125bc18cae564eebc6e78359f194110c1456d7dc4c07155477e6985227f3
font_01_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 17844 bytes
SHA-256: f19f33db8eaf74d57f21d89a9f50fd9c993212ad6732aa60507090e1d1271608
font_02_sfnt_off0001288f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1